1997 SUBARU LEGACY ignition

B2M0578A
10BC4CHECK POWER SUPPLY TO IDLE AIR
CONTROL SOLENOID VALVE.
1) Turn ignition switch to OFF.
2) Disconnect connector from idle air control solenoid
valve.
3) Turn ignition switch to ON.
4) Measure voltage between idle air control solenoid valve
and engine ground.
: Connector & terminal
(E7) No. 2 (+)—Engine ground ():
Is the voltage more than 10 V?
: Go to step10BC5.
: Repair open circuit in harness between idle air
control solenoid valve and main relay connector.
B2M0579A
10BC5CHECK HARNESS BETWEEN ECM AND
IDLE AIR CONTROL SOLENOID VALVE
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM and idle
air control solenoid valve connector.
: Connector & terminal
(B84) No. 14—(E7) No. 1:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between ECM and
idle air control solenoid valve connector.
: Connector & terminal
(B84) No. 13—(E7) No. 3:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
idle air control solenoid valve connector.
B2M0580A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 13—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and idle air control solenoid valve connector.
: Go to next.
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10BD1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code”.
NOTE:
In this case, it is not necessary to inspect DTC P0506.
: Go to step10BD2.
10BD2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is clogging the by-pass line between by-
pass hose and intake duct?
: Repair the by-pass line.
: Replace idle air control solenoid valve.
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10BE1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code”.
NOTE:
In this case, it is not necessary to inspect DTC P0507.
: Go to step10BE2.
10BE2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is there a fault in air intake system?
NOTE:
Check the following items.

Loose installation of intake manifold, idle air control sole-
noid valve and throttle body

Cracks of intake manifold gasket, idle air control sole-
noid valve gasket and throttle body gasket

Loose connections and cracks of idle air control solenoid
valve by-pass hoses

Disconnections of vacuum hoses
: Repair air suction and leaks.
: Replace idle air control solenoid valve.
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B2M0582A
10BF1CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM and data
link connector (for Subaru Select Monitor & OBD-II general
scan tool).
: Connector & terminal
(B84) No. 93—(B40) No. 10:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
data link connector.
B2M0583A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 93—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and data link connector.
: Repair poor contact in ECM connector and data
link connector.
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10BI1
CHECK INHIBITOR SWITCH TYPE.
: Is inhibitor switch type plastic body?
: Go to step10BI2.
: Go to step10BI4.
B2M1107A
10BI2CHECK HARNESS BETWEEN TCM AND
INHIBITOR SWITCH CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and transmission.
3) Measure resistance of harness between TCM and
transmission harness connector.
: Connector & terminal
(B56) No. 9—(T7) No. 8:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and inhibitor
switch connector

Poor contact in coupling connector (B12)
: Connector & terminal
(B56) No. 10—(T7) No. 9:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and inhibitor
switch connector

Poor contact in coupling connector (B12)
: Connector & terminal
(B56) No. 8—(T7) No. 5:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and inhibitor
switch connector.

Poor contact in coupling connector (B12)
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OBD0596A
10BI4CHECK HARNESS BETWEEN TCM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and transmission har-
ness connector.
3) Measure resistance of harness between TCM and
transmission harness connector.
: Connector & terminal
(B56) No. 9—(B12) No. 3:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
: Connector & terminal
(B56) No. 10—(B12) No. 2:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
: Connector & terminal
(B56) No. 8—(B12) No. 1:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
: Connector & terminal
(B54) No. 1—(B12) No. 8:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
: Connector & terminal
(B54) No. 2—(B12) No. 7:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
: Connector & terminal
(B54) No. 3—(B12) No. 6:
Is the resistance less than 1Ω?
: Go to next.
: Repair open circuit in harness between TCM and
transmission harness connector.
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OBD0595A
10BI6
CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and transmission.
3) Turn ignition switch to ON.
4) Measure voltage between TCM and chassis ground.
: Connector & terminal
(B56) No. 9 (+)—Chassis ground ():

Is the voltage less than1Vin“P”and
“N”positions?

Is the voltage more than8Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B56) No. 10 (+)—Chassis ground ():

Is the voltage less than1Vin“R”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B56) No. 8 (+)—Chassis ground ():

Is the voltage less than1Vin“N”and
“P”positions?

Is the voltage more than8Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B54) No. 1 (+)—Chassis ground ():

Is the voltage less than1Vin“D”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B54) No. 2 (+)—Chassis ground ():

Is the voltage less than1Vin“3”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
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10BV2
CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit.
: Is there any trouble in inhibitor switch cir-
cuit?
: Repair or replace inhibitor switch circuit.
: Go to step10BV3.
OBD0145A
10BV3
CHECK GEAR POSITION.
1) Turn ignition switch to OFF.
2) Connect the Subaru select monitor to data link connec-
tor.
3) Lift-up or raise the vehicle and support with safety
stands.
CAUTION:
On AWD models, raise all wheels off ground.
4) Start and warm-up the engine and transmission.
H2M1150
5) Subaru select monitor switch to ON.
6) Select AT mode using function key.
Press the function key [/], and change to AT mode.
7) Press the function key [0].
G3M0152
8) Designate mode using function key.
Function mode for AT: F10
OBD0615
9) Move selector lever to“D”and drive the vehicle.
10) Read data on Subaru select monitor.
: Does gear position change according to
throttle position and vehicle speed?
: Go to next.
: Go to step10BV4.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Go to next.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles